PR-117 ANEMOMETER (CUP ANEMOMETER AS PER ISI)

An anemometer is a device used for measuring wind speed, and is a common weather station instrument.

The simplest and the earliest anemometer consisted of four hemispherical cups. Later the three cup anemometer was developed which had a more constant torque and responded more quickly to gusts than the four cup anemometer.

The instrument has a cup wheel consisting of three conical cups in a horizontal plane.

The cup wheel spindle is of steel and has a connected worm gearing to a revolution counter mounted in a water proof housing.

By observing the counter reading at the beginning and at the end of any period of interval, the average wind speed during the interval can be calculated.